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Push mower will not start....

#1

T

Tikal

It has spark but their seems to be something wrong with the gas system,
I cleaned the carb and it still would not start, cleaned the gas tank and it still refused to start. What is the problem?

Please help!!

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#2

K

KennyV

Take wing nut & top off the air cleaner, spray some starting fluid into it and see if it then tries to start... :smile:KennyV


#3

Two-Stroke

Two-Stroke

That is one really cool old mower -- so please don't give up on it. :thumbsup:

If you crank it several times and remove the plug, the plug should be wet with fuel -- if the gas is making it into the cylinder -- is it?

When you're trying to start it, does is fire at all?

Good luck and please keep up posted on this fine machine. It looks like it's mid-1960s -- what do you know about it?


#4

T

Tikal

KennyV said:
Take wing nut & top off the air cleaner, spray some starting fluid into it and see if it then tries to start... :smile:KennyV

I tried that already, I will try to replace the the spark plug today.
Thanks!

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#5

T

Tikal

I will try that, thanks! Yes this mower is really cool! You can push on both sides, i think it looks like a steam engine. Our elderly neighbor has lots of old ones and he gave this one to me.

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#6

T

Tikal

I changed the spark plug and now stuff is coming out of the muffler, and yes the spark plug was wet. It seemed to try to start but it still could not, and that was with the air filter out.
The air filter has fishing string in it, I guess the fishing string acted
like an air filter awhile ago.

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#7

Two-Stroke

Two-Stroke

I will try that, thanks! Yes this mower is really cool! You can push on both sides, i think it looks like a steam engine. Our elderly neighbor has lots of old ones and he gave this one to me.

Does your neighbor have any old (pre-1980) Lawn-Boy two-strokes in his collection? If you're interested in fixing old mowers those are some of the best ever made -- well worth your time because they're awesome once they're running right.


#8

Two-Stroke

Two-Stroke

I changed the spark plug and now stuff is coming out of the muffler, and yes the spark plug was wet. It seemed to try to start but it still could not, and that was with the air filter out.
The air filter has fishing string in it, I guess the fishing string acted
like an air filter awhile ago.

Is fuel (unburned) coming out of the muffler? When you say it "tries to start" do you mean that it fires somewhat but never really starts?

Have you looked at the main jet adjustment on the carb? Did you clean that when you cleaned the carb?

Have you looked at the points? You might have to remove the flywheel (may be very difficult if it hasn't been off in 30 years :eek: ) to get to them.


#9

T

Tikal

Two-Stroke said:
I do not know but I will check.
If he does, how much should I pay if it is in fair condition?

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#10

T

Tikal

Two-Stroke said:
Is fuel (unburned) coming out of the muffler? When you say it "tries to start" do you mean that it fires somewhat but never really starts?

Have you looked at the main jet adjustment on the carb? Did you clean that when you cleaned the carb?

Have you looked at the points? You might have to remove the flywheel (may be very difficult if it hasn't been off in 30 years :eek: ) to get to them.

Yes it fires every once in awhile.
The spark definitely works, my brother found out the hard way(metal conducts electricity! Never new that:) but that was only once, the spark might only be working every once in awhile.
Where is the main jet? I took the whole carb off and washed it.

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#11

Two-Stroke

Two-Stroke

If he does, how much should I pay if it is in fair condition?

Very rough guideline (based on my experience in the SE -- prices vary by location):

1970s two-stroke, alloy deck, no major problems but doesn't look great: $30 to $50

1960s two-stroke, alloy deck, no major problems but doesn't look great: $50 to $100
(more for a "brick-top")

Pre-1960: more than $100 -- maybe quite a bit more

Look on eBay -- these mowers go on sale and, if in mint condition, sell for big bucks.


#12

Two-Stroke

Two-Stroke

...
Where is the main jet?

There may be only one jet but sometimes there's an idle jet and a main jet. The main jet dispenses fuel out of a little hole at the venturi (where the carb's main tube narrows and the fuel is mixed with air before gong into the combustion chamber). There will be an adjustment screw (usually with a spring holding it in place) that regulates the amount of fuel that gets mixed. Turning the screw clockwise makes the mixture leaner (less gas in proportion to the air.)

I like to clean a carb by taking it apart completely blowing compressed air through every hole I see.


#13

T

Tikal

I will try turning the screw tomorrow.
Do you have any pictures of your
Lawn-Boys?

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#14

Two-Stroke

Two-Stroke

I will try turning the screw tomorrow.
Do you have any pictures of your
Lawn-Boys?

Here's the 1977 model 7266:

Lawn-Boy-front.jpg


This is a 1974 model 8232. I have two of these -- one of which is a parts mower but it may be fixed at some point.

LB8232-2.jpg


About your neighbor who has the older mowers -- could you examine some of the neat looking ones, getting brand names and model numbers -- and maybe take some photos. And while you're at it, ask him to join LMF.


#15

T

Tikal

He said that this lawn mower is about 100 years old! It's blades are really interesting looking.

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#16

T

Tikal

Almost all of his mowers look like this(no pull cord) but you can find the pieces after looking around for awhile. I told him about LMF but he said only his wife knows how to operate the computer:) he said he has no Lawn-Boys.

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#17

K

KennyV

He said that this lawn mower is about 100 years old! It's blades are really interesting looking.

What blades are on that mower?...
Neat older engine, but it's closer to 50 years old ... :smile:KennyV


#18

T

Tikal


Well....he might of forgot :)

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#19

T

Tikal

Tikal said:
Almost all of his mowers look like this(no pull cord) but you can find the pieces after looking around for awhile. I told him about LMF but he said only his wife knows how to operate the computer:) he said he has no Lawn-Boys.

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I put a new spark plug into my push mower and sprayed starter fluid down the carb and it started for a few seconds and than made a little screeching sound and stopped, and I tried again and the same thing happened (mystified)
What does that mean??

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#20

Two-Stroke

Two-Stroke

He said that this lawn mower is about 100 years old! It's blades are really interesting looking.

Well... not quite 100 years old -- it looks like 1950s vintage. Still an interesting mower.

I had a mini-bike with a Clinton engine way back when. :cool:

edit: I wrote this before I noticed that KennyV beat me to it regarding the age. :laughing:


#21

Two-Stroke

Two-Stroke

Almost all of his mowers look like this(no pull cord) but you can find the pieces after looking around for awhile. I told him about LMF but he said only his wife knows how to operate the computer:) he said he has no Lawn-Boys.

I've never heard of the brand "Hahn Eclipse" but the engine looks like a Briggs & Stratton from the 1960s. That might be worth fixing. Is the deck steel or alloy?


#22

Two-Stroke

Two-Stroke

I put a new spark plug into my push mower and sprayed starter fluid down the carb and it started for a few seconds and than made a little screeching sound and stopped, and I tried again and the same thing happened (mystified)
What does that mean??

That means that the problem is most likely in the carb -- or the fuel system in general.

Thanks for taking the photos of the old mowers. Are there any Jacobsen mowers in his stash? That was one of the best brands back in the 1950s through the 1970s.


#23

T

Tikal

Are there any Jacobsen mowers in his stash? That was one of the best brands back in the 1950s through the 1970s.

I don't think so:(
Some person told me to check the flywheel key on my push mower because it could be bent or sompin like that, the problem is that I will have to take the flywheel off(reaaaaaaaaaaaly hard) is there any way to take the key out without taking the flywheel off (or should I take it to a professional to take the flywheel off?)
thanks for helping!!!

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#24

T

Tikal

Two-Stroke said:
I've never heard of the brand "Hahn Eclipse" but the engine looks like a Briggs & Stratton from the 1960s. That might be worth fixing. Is the deck steel or alloy?

I do not know but will check;)

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#25

Two-Stroke

Two-Stroke

Some person told me to check the flywheel key on my push mower because it could be bent or sompin like that, the problem is that I will have to take the flywheel off(reaaaaaaaaaaaly hard) is there any way to take the key out without taking the flywheel off (or should I take it to a professional to take the flywheel off?)

No. I'm pretty sure you have to remove the flywheel to inspect/replace the key. When you have it off you can look at the points -- if they haven't been checked for a long time that would be worth trying.

But I think -- based on your experiment with priming the carb -- that the problem is most likely with the carb.

Have you checked the float valve? When the float is in the "up" position it should not allow anything to pass through -- when it is "down" there should be free flow (gas from the tank into the bowl at the bottom of the carb.)

That shouldn't be too hard to check.

Please keep us posted on your results. Photos (of the carb, in various states of assembly) might help.


#26

T

Tikal

Two-Stroke said:
No. I'm pretty sure you have to remove the flywheel to inspect/replace the key. When you have it off you can look at the points -- if they haven't been checked for a long time that would be worth trying.

But I think -- based on your experiment with priming the carb -- that the problem is most likely with the carb.

Have you checked the float valve? When the float is in the "up" position it should not allow anything to pass through -- when it is "down" there should be free flow (gas from the tank into the bowl at the bottom of the carb.)

That shouldn't be too hard to check.

Please keep us posted on your results. Photos (of the carb, in various states of assembly) might help.

Where is the float valve? It it near the screw with the spring?

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#27

Two-Stroke

Two-Stroke

Where is the float valve? It it near the screw with the spring?

On the bottom of the carb there's cylindrical thing that looks like it could hold about 3 oz of liquid. It's attached to the carb by three or four screws. If you remove those screws and the "bowl" you'll see the float (looks like a little doghnut) which operates the valve that I refereed to.


#28

T

Tikal

Two-Stroke said:
On the bottom of the carb there's cylindrical thing that looks like it could hold about 3 oz of liquid. It's attached to the carb by three or four screws. If you remove those screws and the "bowl" you'll see the float (looks like a little doghnut) which operates the valve that I refereed to.

I think I found one of the problems with the gas system.
The tube that goes into the tank has a clog,(you cannot blow either way) I tried to get it out but failed to do so. Is there any chemicals to get the clog out? I could not find the cylindrical think you were talking about, is it in the pictures?

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#29

T

Tikal

After I took the carburetor off there was a tube sticking out, it had nothing in it and looked completely useless. (in the photo) so I took the tube and the cover off and it looked even weirder! What is it? should there be something in the tube?

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#30

Two-Stroke

Two-Stroke

I think I found one of the problems with the gas system.
The tube that goes into the tank has a clog,(you cannot blow either way) I tried to get it out but failed to do so. Is there any chemicals to get the clog out? I could not find the cylindrical think you were talking about, is it in the pictures?

This type of carb does not have a bowl and float. Let's refer to this photo:

2301d1307656605-push-mower-will-not-start-image-921473407-png


The tube that sticks out to the left goes down into the gas tank. I has a screen-type filter on the bottom -- make sure that's not clogged. Also, try unclogging this tube when you've removed the main jet adjustment (see below.)

There's a screw with a spring and a hex nut on top (from this photo's perspective) -- that, I'm pretty sure, is the main jet. Remove the screw with the spring then remove the hex nut. Look inside -- is there another screw that can be removed? If so take it out too. Clean all that stuff and put it back together. When you reinstall the screw with the spring turn it gently until it won't go farther then turn it back one turn (this is the mixture adjustment you'll play with when you get it running and warmed up.)

You can get carb cleaner at auto parts stores -- Wal-Mart probably has it too. If you could blow compressed air through that clogged tube you might clear it -- I think that clogging is a major part of the problem.


#31

Two-Stroke

Two-Stroke

After I took the carburetor off there was a tube sticking out, it had nothing in it and looked completely useless. (in the photo) so I took the tube and the cover off and it looked even weirder! What is it? should there be something in the tube?

That tube is the crankcase "breather". When the piston goes up and down it displaces air and that tube gives the displaced air somewhere to go. If the tube is unblocked it's OK.


#32

K

KennyV

Two-Stroke has you heading the right direction...
On the opposite side of the carb, you should find a small plate held on with 2 or 4 screws... that has a small spring and diaphragm under it... That is the fuel pump on this type carb... Remove the cover plate, and replace the little pump diaphragm, note the direction the spring is placed...

With the fuel pump open you will be able to blow through the pick up tube... If not spray carb cleaner into the fuel ports inside the pump... :smile:KennyV


#33

K

KennyV

if this carb is without the side mounted fuel pump, it will be simular to the one in this video...
YouTube - ‪CARBURETOR Repair on Older BRIGGS & STRATTON 3.5HP Engine Part 1 of 2‬‏
:smile:KennyV


#34

T

Tikal

KennyV said:
if this carb is without the side mounted fuel pump, it will be simular to the one in this video...
YouTube - CARBURETOR Repair on Older BRIGGS & STRATTON 3.5HP Engine Part 1 of 2 ‏
:smile:KennyV

Yes, it has no side mount. I soaked the part that goes and sucks gas from the tank in carb cleaner overnight, I will see how that works a little later;)

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#35

T

Tikal

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On another mower I have I need to replace the drive belt, how do I do it to this particular set up? I cannot get the belt protector off, is there a way??

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